Timing belt replacement, I lost timing marks

VICTORY76

MEMBER
2005 TOYOTA SIENNA
300,000 MILES

Experienced mechanic messes up (me) removed old timing belt I saw marks aligned but old belt erased marks. I'm trying to install the new one starting from the crankshaft up to the cam #2 align mark to go to cam #1 align mark but the belt is not tight tensioner go up all the way belt still not tight proceeding from cam#2 to cam #1 after installing on crankshaft sprocket is one tooth after the mark. I got lost here. Can you please help me? What is the best way to make sure marks are correct as I remove the spark plug to check if the piston is up as I said before marks were all aligning but old belt has no marks.

1 Reply

SQM

MECHANIC
6,383 POSTS

Hello,

There should be the top dead center marking on the pulleys, which can help you line up the belt.
Also, the belt needs to be installed in a specific sequence in order for it to go on properly.

I have attached the complete timing belt replacement procedure below. Take a look, it covers all the details and marking and sequences for the removal and installation.

Let me know of any questions.
Thank you.

https://www.2carpros.com/articles/how-a-timing-belt-works

Images (Click to make bigger)